Spray gun



Jan. 11 1927. 1,613,823 w. F. GRADOLPH E AL SPRAY GUN Filed August 2,1924 Patented Jan. 11, 1927.

UNITED STATES WILLIAM F. GRADOLPH AND GODFREY MUELLERQOF TOLEDO, OHIO,ASSIGNORS T 7 THE DE VILBISS MANUFACTURING COMPANY, OF TOLEDO, OHIO, ACORPORATION or OHIO.

guns, which control is adapted to be sub I stituted for the handles ofhand operated spray guns .to provide a mounting and opcrating means forsuch guns. I

The invention is fully described in the following specification, andwhile in its broader aspect it is capable of embodiment in numerousforms, two onl of such embodiments are illustrated'in t e accompany ingdrawings, in which- Figure 1 is a side elevation of a spray gunembodying the invention with parts broken away and with the controlmeans in normal at rest position, and F ig. 2 is a similar elevation ofa spray gun with parts broken away and removed and embodying a differentform of the invention. I

Referring to the drawings, 1 designates the body of a spray gun of atype commonly used, having a rea'rwardly projecting shank 2 to which ahandle or other carryin means may be attached, and having at its orwardend a spray-head 3. Nipples 4 and 5 are provided "on the body 1 forconnection, respectively, with air pressure and paint, or othermaterial, supplytubes, and the passage of air'to the spray-head iscontrolled by a valve having a reciprocally movable stem 6, while thepassage to the sprayhead of material to be sprayed is controlled by avalve having a reciprocally movable stem 7, as well understood in theart. .A springpressed plunger 8 is mounted in the shank 2 to bearagainst the rear end of the stem 7 to hold its valve normally seated,and a spring 9 acts on the air valve to n"rmally maintain it seated. Fora more etailed description of a spray gun of this construction referenceis made to our co-pending application Serial No. 682,700, filed December26, 1923. v p

A trigger or valve operatingmember 10 'at the :rear edge portion of itsuppier or split to straddle the stem 7. solenoid is energized by thepassage of an PATENT OFFICE.

SPRAY GUN.

Application filed August 2, 1924. Serial No. 729,713.

is mounted on a pivot 11 within a portion of the body 1 in advance ofthe shank 2 and has a finger 12 projecting up in engaging relation tothe rear end of the valve stem 6, and a finger 13 projecting down inadvance of a shoulder 14 onthe stem 7 in engaging relation thereto. Thetrigger'lO has a third finger 15 projecting rearwardly therefrom andadapted, when swung upward, to cause the finger 12 t6 have valve openingengage ment with the stem 6 and the finger 13 to have valve, openingengagement with the stem7. The construction, sofar described,

is old, except that the trigger 'finger 15 in the former constructionextended down into position below the body of the gun to be engaged by afinger of the hand of the operator holding the gun.

The instrument is supported in usable position on the machine orapparatus with which associated by a standard 16 provided at one sidewith an apertured ear 17 to enable it to be clamped to a suitablesupport(not shown). The standard 16 is provide% en with a boss 18 having ahorizonta y disposed opening therethrough for receiving the shank 2 ofthe gun body, being held on said shank by a nut 19 threaded on the rearend of the shank.

, A chamber 20 is provided in the standard 16 and the standard is madeof two separable parts a and b, which are threaded together, to permitaccess to said chamber. solenoid frame 21"carrying an electric coil 22is mounted in the chamber 20, and a core-- post 23 is movably mounted inthe frame 21 and coil 22 longitudinally of the standard 16, projectingat its upper end through the upper end of the standard in advance of theboss 18 and shank 2 andbein forkgd en t e electric current through itscoil, the corepost 23 moves upward and its upper end strikes thetriggerfinger 15 and effects a rocking of the finger to move both valve stems 6and 7 to open positions to,efiect a discharge of material in spray formfrom the spray-head. 3 of the gun.

The leads for the coil 22 extend from the chamber through a conduit 24that is con nected to the lower end of the standard 16 with its openingin communication with said chamber.

In the form of the invention shown in Fig. 2 the standard which carriesthe gun is designated 25 and forms a cylindrical chamber 26, the outerend of which is closed by a cap 27 having an air line of fluid pressureconnection 28 in communication with the interior of the chamber. Apiston or plunger 29 is mounted in the cylinder 26 and has a stem 30projecting upward therefrom through a registering opening in the upperend of the cylinder and into position to engage the trigger finger 15and operate the trigger to open both control valves of the gun on anupward fluid actuated stroke of the plunger within the cylinder. Thecylinder 25 is provided with a relief vent 31. A coiled expansion spring32 is interposed between the plunger 29 and upper end of the cylinder inencircling relation to the stem 30, and acts to normally retain theplunger in its lowered position.

It is evident with both forms of the invention that upon an upwardmovement of the trigger actuating member, whether such memberconstitutes an electrically operated core member 23, a fluid actuatedstem 30-or some other automatically actuated part, the finger 15 of thetrigger is engaged thereby and a rocking of the trigger efi'ected so asto cause the finger 12 to engage the valve stem- 6 and the finger 13 toengage the shoulder 14 of the valve stem 7 andimpart valve openingmovements to such stems. As soon as the force which actuates the triggeroperating movement of the control member has been removed, such memberwill return to its normal inoperative position, permit-.

ting aclosing of the air and liquid control valves of the gun.

We wish it understood that our invention is not limited to any specificconstruction, arrangementor form of the parts as it is capable ofnumerous modifications changes without departing from the spirit of theclaims.

Having thus described our invention, what weclaim as new and desiretosecure by Letters Patent i 1., A spray gun having air and liquidcontrol valve stems, a trigger operable to en gage both stems to impartopening movements to the respective valves, a movable member operable toengage the trigger and impart valve opening movements thereto, and meansoperable to impart trigger actuating movements to the member.

2. A spray gun having an air valve stem and a liquid valve stem, atrigger having separate fingers acting on said stems to impart openingmovements thereto in reverse and directions when the trigger is rockedin one direction, and means having a member movable transverse to thetrigger axis and operable to engage and actuate the trigger to impartvalve opening movements to said stems.

3. A spray gun having a body, controlvalve stems movably carried by saidbody, a trigger pivoted to the body and operable. \vhen rocked in onedirection, to engage and impart valve opening movements to said stems, astandard supporting the body and having a chamber therein, and meansmounted in the (hamber and having a member projecting therefrom adjacenttosaid trigger, said means being operable to actuate said member toengage and impart valve opening movements to the valve stems.

4.- A spray gun having a body with a spray-head at one end, and a shankprojecting from its other end, control-valve stems mounted in the bodyand operable to control the discharge of air and material from thespray-head, a trigger pivotally mounted within the body in advance ofthe shank and in engaging relation to said valve stems, a body supportin engagement with said shank and having a chamber therein, and meansdisposed within the chamber and having a reciprocally movable partprojecting therefrom 1n trigger engaging position and operable toactuate the trigger to im part valve opening movements to the stems.

5. A spray gun having a body with a spray-head at one end and a shankprojecting from its opposite end, control-valve ing position, said meansbeing operable to" move said part to engage and actuate said trigger toimpart valve opening movements to said stems.

6. A spray-gun having control 'valves for the discharge therefrom of airand the material being sprayed, and means operable to open said valvesincluding a trigger member and a reciprocally movable member foractuating the trigger member.

7. A spray-gun having control valves for I the discharge of air andliquid therefrom, a valve actuating member movable to act on the valvesto effect an opening thereof, and electrically operated means having aplunger part for engaging and actuating the valve opening movements ofsaid mem- 8. A, pray-headhaving separate discharge orifices for materialto be sprayed and a motive agent, a separate. valve for controlling thedischarge from each orifice, electrically operated means having areciprocally movable plun er part, and connection between each of saivalves and said plunger 10 part operable to open the valves when themeans is energized.

In testimony whereof, we have hereunto signed our'names to thisspecification.

WILLIAM F. GRADOLPH.

GODFREY MUELLER.

